virtio-rng: fix boot with virtio-rng device
virtio-rng: fix boot with virtio-rng device

Commit "virtio-rng: support multiple virtio-rng devices" has broken
boot with a virtio-rng device because the 'init' callback of the
virtio-rng device was left unitialized to garbage, and got called
by the hwrng infrastructure, killing the guest on boot.

Signed-off-by: Sasha Levin <e642b69ed2fc111e09ffdc37feb733a52253340d@oracle.com>
Signed-off-by: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>
Fixes: 08e53fbdb85c0f6f45c0f7c1ea3defc1752a95ce

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs